When you configure the AWS Database Encryption SDK for DynamoDB, you provide attribute actions. On encrypt, AWS Database Encryption SDK uses the attribute actions to identify which attributes to encrypt and sign, which attributes to sign (but not encrypt), and which to ignore. You also define allowed unsigned attributes to explicitly tell the client which attributes are excluded from the signatures. On decrypt, the AWS Database Encryption SDK uses the allowed unsigned attributes that you defined to identify which attributes are not included in the signatures. Attribute actions are not saved in the encrypted item and the AWS Database Encryption SDK does not update your attribute actions automatically.
Choose your attribute actions carefully. When in doubt, use Encrypt and sign. After you have used the AWS Database Encryption SDK to protect your items, you cannot change an existing ENCRYPT_AND_SIGN, SIGN_ONLY, or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute to DO_NOTHING. However, you can safely make the following changes.
Before you update your data model, carefully consider how your updates might impact any beacons you constructed from the attributes. After you have written new records with a beacon, you cannot update the beacon's configuration. You cannot update the attribute actions associated with the attributes you used to construct beacons. If you remove an existing attribute and its associated beacon, you will not be able to query existing records using that beacon. You can create new beacons for new fields that you add to your record, but you cannot update existing beacons to include the new field.
Considerations forSIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attributes
By default, the partition and sort keys are the only attribute included in the encryption context. You might consider defining additional fields as SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT so that the branch key ID supplier for your AWS KMS Hierarchical keyring can identify which branch key is required for decryption from the encryption context. For more information, see branch key ID supplier. If you specify any SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attributes, then the partition and sort attributes must also be SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT.
To use the SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT cryptographic action, you must use version 3.3 or later of the AWS Database Encryption SDK. Deploy the new version to all readers before updating your data model to include SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT.
ENCRYPT_AND_SIGN, SIGN_ONLY, and SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attributes
To add a new ENCRYPT_AND_SIGN, SIGN_ONLY, or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute, define the new attribute in your attribute actions.
You cannot remove an existing DO_NOTHING attribute and add it back as an ENCRYPT_AND_SIGN, SIGN_ONLY, or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute.
If you defined your attribute actions with a TableSchema, add the new attribute to your annotated data class. If you do not specify an attribute action annotation for the new attribute, the client will encrypt and sign the new attribute by default (unless the attribute is part of the primary key). If you only want to sign the new attribute, you must add the new attribute with the @DynamoDBEncryptionSignOnly or @DynamoDBEncryptionSignAndIncludeInEncryptionContext annotation.
If you manually defined your attribute actions, add the new attribute to the attribute actions in your object model and specify ENCRYPT_AND_SIGN, SIGN_ONLY, or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT as the attribute action.
If you decide that you no longer need an attribute, you can stop writing data to that attribute or you can formally remove it from your attribute actions. When you stop writing new data to an attribute, the attribute still shows up in your attribute actions. This can be helpful if you need to start using the attribute again in the future. Formally removing the attribute from your attribute actions does not remove it from your dataset. Your dataset will still contain items that include that attribute.
To formally remove an existing ENCRYPT_AND_SIGN, SIGN_ONLY, SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT, or DO_NOTHING attribute, update your attribute actions.
If you remove a DO_NOTHING attribute, you must not remove that attribute from your allowed unsigned attributes. Even if you are no longer writing new values to that attribute, the client still needs to know that the attribute is unsigned to read existing items that contain the attribute.
If you defined your attribute actions with a TableSchema, remove the attribute from your annotated data class.
If you manually defined your attribute actions, remove the attribute from the attribute actions in your object model.
Change an existingENCRYPT_AND_SIGN attribute to SIGN_ONLY or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT
To change an existing ENCRYPT_AND_SIGN attribute to SIGN_ONLY or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT, you must update your attribute actions. After you deploy the update, the client will be able to verify and decrypt existing values written to the attribute, but will only sign new values written to the attribute.
Carefully consider your security requirements before changing an existing ENCRYPT_AND_SIGN attribute to SIGN_ONLY or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT. Any attribute that can store sensitive data should be encrypted.
If you defined your attribute actions with a TableSchema, update the existing attribute to include the @DynamoDBEncryptionSignOnly or @DynamoDBEncryptionSignAndIncludeInEncryptionContext annotation in your annotated data class.
If you manually defined your attribute actions, update the attribute action associated with the existing attribute from ENCRYPT_AND_SIGN to SIGN_ONLY or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT in your object model.
SIGN_ONLY or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute to ENCRYPT_AND_SIGN
To change an existing SIGN_ONLY or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute to ENCRYPT_AND_SIGN, you must update your attribute actions. After you deploy the update, the client will be able to verify the existing values written to the attribute, and will encrypt and sign new values written to the attribute.
If you defined your attribute actions with a TableSchema, remove the @DynamoDBEncryptionSignOnly or @DynamoDBEncryptionSignAndIncludeInEncryptionContext annotation from the existing attribute.
If you manually defined your attribute actions, update the attribute action associated with the attribute from SIGN_ONLY or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT to ENCRYPT_AND_SIGN in your object model.
DO_NOTHING attribute
To reduce the risk of error when adding a new DO_NOTHING attribute, we recommend specifying a distinct prefix when naming your DO_NOTHING attributes, and then using that prefix to define your allowed unsigned attributes.
You cannot remove an existing ENCRYPT_AND_SIGN, SIGN_ONLY, or SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute from your annotated data class and then add the attribute back as a DO_NOTHING attribute. You can only add entirely new DO_NOTHING attributes.
The steps you take to add a new DO_NOTHING attribute depend on whether your defined your allowed unsigned attributes explicitly in a list or with a prefix.
If you defined your attribute actions with a TableSchema, add the new DO_NOTHING attribute to your annotated data class with the @DynamoDBEncryptionDoNothing annotation. If you manually defined your attribute actions, update your attribute actions to include the new attribute. Be sure to explicitly configure the new attribute with the DO_NOTHING attribute action. You must include the same distinct prefix in the new attribute's name.
Add the new DO_NOTHING attribute to your allowed unsigned attributes list and deploy the updated list.
Deploy the change from Step 1.
You cannot move on to Step 3 until the change has propagated to all hosts that need to read this data.
Add the new DO_NOTHING attribute to your attribute actions.
If you defined your attribute actions with a TableSchema, add the new DO_NOTHING attribute to your annotated data class with the @DynamoDBEncryptionDoNothing annotation.
If you manually defined your attribute actions, update your attribute actions to include the new attribute. Be sure to explicitly configure the new attribute with the DO_NOTHING attribute action.
Deploy the change from Step 3.
SIGN_ONLY attribute to SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT
To change an existing SIGN_ONLY attribute to SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT, you must update your attribute actions. After you deploy the update, the client will be able to verify the existing values written to the attribute, and will continue to sign new values written to the attribute. New values written to the attribute will be included in the encryption context.
If you specify any SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attributes, then the partition and sort attributes must also be SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT.
If you defined your attribute actions with a TableSchema, update the attribute action associated with the attribute from @DynamoDBEncryptionSignOnly to @DynamoDBEncryptionSignAndIncludeInEncryptionContext.
If you manually defined your attribute actions, update the attribute action associated with the attribute from SIGN_ONLY to SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT in your object model.
SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute to SIGN_ONLY
To change an existing SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute to SIGN_ONLY, you must update your attribute actions. After you deploy the update, the client will be able to verify the existing values written to the attribute, and will continue to sign new values written to the attribute. New values written to the attribute will not be included in the encryption context.
Before changing an existing SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT attribute to SIGN_ONLY, carefully consider how your updates might impact the functionality of your branch key ID supplier.
If you defined your attribute actions with a TableSchema, update the attribute action associated with the attribute from @DynamoDBEncryptionSignAndIncludeInEncryptionContext to @DynamoDBEncryptionSignOnly.
If you manually defined your attribute actions, update the attribute action associated with the attribute from SIGN_AND_INCLUDE_IN_ENCRYPTION_CONTEXT to SIGN_ONLY in your object model.
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